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[perl5.git] / op.h
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a0d0e21e 1/* op.h
79072805 2 *
4eb8286e 3 * Copyright (c) 1991-1999, Larry Wall
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4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
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8 */
9
10/*
11 * The fields of BASEOP are:
12 * op_next Pointer to next ppcode to execute after this one.
13 * (Top level pre-grafted op points to first op,
14 * but this is replaced when op is grafted in, when
15 * this op will point to the real next op, and the new
16 * parent takes over role of remembering starting op.)
17 * op_ppaddr Pointer to current ppcode's function.
18 * op_type The type of the operation.
19 * op_flags Flags common to all operations. See OPf_* below.
20 * op_private Flags peculiar to a particular operation (BUT,
21 * by default, set to the number of children until
22 * the operation is privatized by a check routine,
23 * which may or may not check number of children).
24 */
25
4633a7c4 26typedef U32 PADOFFSET;
11343788 27#define NOT_IN_PAD ((PADOFFSET) -1)
79072805 28
4633a7c4 29#ifdef DEBUGGING_OPS
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30#define OPCODE opcode
31#else
32#define OPCODE U16
33#endif
34
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35#ifdef BASEOP_DEFINITION
36#define BASEOP BASEOP_DEFINITION
37#else
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38#define BASEOP \
39 OP* op_next; \
40 OP* op_sibling; \
76e3520e 41 OP* (CPERLscope(*op_ppaddr))_((ARGSproto)); \
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42 PADOFFSET op_targ; \
43 OPCODE op_type; \
44 U16 op_seq; \
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45 U8 op_flags; \
46 U8 op_private;
0f4eea8f 47#endif
79072805 48
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49#define OP_GIMME(op,dfl) \
50 (((op)->op_flags & OPf_WANT) == OPf_WANT_VOID ? G_VOID : \
51 ((op)->op_flags & OPf_WANT) == OPf_WANT_SCALAR ? G_SCALAR : \
52 ((op)->op_flags & OPf_WANT) == OPf_WANT_LIST ? G_ARRAY : \
53 dfl)
54
533c011a 55#define GIMME_V OP_GIMME(PL_op, block_gimme())
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56
57/* Public flags */
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58
59#define OPf_WANT 3 /* Mask for "want" bits: */
60#define OPf_WANT_VOID 1 /* Want nothing */
61#define OPf_WANT_SCALAR 2 /* Want single value */
62#define OPf_WANT_LIST 3 /* Want list of any length */
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63#define OPf_KIDS 4 /* There is a firstborn child. */
64#define OPf_PARENS 8 /* This operator was parenthesized. */
463ee0b2 65 /* (Or block needs explicit scope entry.) */
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66#define OPf_REF 16 /* Certified reference. */
67 /* (Return container, not containee). */
68#define OPf_MOD 32 /* Will modify (lvalue). */
69#define OPf_STACKED 64 /* Some arg is arriving on the stack. */
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70#define OPf_SPECIAL 128 /* Do something weird for this op: */
71 /* On local LVAL, don't init local value. */
72 /* On OP_SORT, subroutine is inlined. */
73 /* On OP_NOT, inversion was implicit. */
a0d0e21e 74 /* On OP_LEAVE, don't restore curpm. */
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75 /* On truncate, we truncate filehandle */
76 /* On control verbs, we saw no label */
77 /* On flipflop, we saw ... instead of .. */
78 /* On UNOPs, saw bare parens, e.g. eof(). */
a0d0e21e 79 /* On OP_ENTERSUB || OP_NULL, saw a "do". */
f2ec2afd 80 /* On OP_(ENTER|LEAVE)EVAL, don't clear $@ */
54b9620d 81 /* On OP_ENTERITER, loop var is per-thread */
79072805 82
54310121 83/* old names; don't use in new code, but don't break them, either */
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84#define OPf_LIST OPf_WANT_LIST
85#define OPf_KNOW OPf_WANT
54310121 86#define GIMME \
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87 (PL_op->op_flags & OPf_WANT \
88 ? ((PL_op->op_flags & OPf_WANT) == OPf_WANT_LIST \
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89 ? G_ARRAY \
90 : G_SCALAR) \
91 : dowantarray())
54310121 92
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93/* Private for lvalues */
94#define OPpLVAL_INTRO 128 /* Lvalue must be localized */
95
96/* Private for OP_AASSIGN */
97#define OPpASSIGN_COMMON 64 /* Left & right have syms in common. */
98
99/* Private for OP_SASSIGN */
100#define OPpASSIGN_BACKWARDS 64 /* Left & right switched. */
79072805 101
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102/* Private for OP_MATCH and OP_SUBST{,CONST} */
103#define OPpRUNTIME 64 /* Pattern coming in on the stack */
104
79072805 105/* Private for OP_TRANS */
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106#define OPpTRANS_FROM_UTF 1
107#define OPpTRANS_TO_UTF 2
108#define OPpTRANS_IDENTICAL 4
109 /* When CU or UC, means straight latin-1 to utf-8 or vice versa */
110 /* Otherwise, IDENTICAL means the right side is the same as the left */
111#define OPpTRANS_SQUASH 8
112#define OPpTRANS_DELETE 16
113#define OPpTRANS_COMPLEMENT 32
114#define OPpTRANS_GROWS 64
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115
116/* Private for OP_REPEAT */
a0d0e21e 117#define OPpREPEAT_DOLIST 64 /* List replication. */
79072805 118
a0d0e21e 119/* Private for OP_ENTERSUB, OP_RV2?V, OP_?ELEM */
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120#define OPpDEREF (32|64) /* Want ref to something: */
121#define OPpDEREF_AV 32 /* Want ref to AV. */
122#define OPpDEREF_HV 64 /* Want ref to HV. */
123#define OPpDEREF_SV (32|64) /* Want ref to SV. */
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124 /* OP_ENTERSUB only */
125#define OPpENTERSUB_DB 16 /* Debug subroutine. */
7a52d87a 126 /* OP_RV2CV only */
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127#define OPpENTERSUB_AMPER 8 /* Used & form to call. */
128 /* OP_?ELEM only */
129#define OPpLVAL_DEFER 16 /* Defer creation of array/hash elem */
130 /* for OP_RV2?V, lower bits carry hints */
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131
132/* Private for OP_CONST */
7a52d87a 133#define OPpCONST_STRICT 8 /* bearword subject to strict 'subs' */
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134#define OPpCONST_ENTERED 16 /* Has been entered as symbol. */
135#define OPpCONST_ARYBASE 32 /* Was a $[ translated to constant. */
a0d0e21e 136#define OPpCONST_BARE 64 /* Was a bare word (filehandle?). */
599cee73 137#define OPpCONST_WARNING 128 /* Was a $^W translated to constant. */
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138
139/* Private for OP_FLIP/FLOP */
a0d0e21e 140#define OPpFLIP_LINENUM 64 /* Range arg potentially a line num. */
79072805 141
ed6116ce 142/* Private for OP_LIST */
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143#define OPpLIST_GUESSED 64 /* Guessed that pushmark was needed. */
144
5f05dabc 145/* Private for OP_DELETE */
54310121 146#define OPpSLICE 64 /* Operating on a list of keys */
5f05dabc 147
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148/* Private for OP_SORT, OP_PRTF, OP_SPRINTF, string cmp'n, and case changers */
149#define OPpLOCALE 64 /* Use locale */
150
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151/* Private for OP_SORT */
152#define OPpSORT_NUMERIC 1 /* Optimized away { $a <=> $b } */
153#define OPpSORT_INTEGER 2 /* Ditto while under "use integer" */
154#define OPpSORT_REVERSE 4 /* Descending sort */
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155/* Private for OP_THREADSV */
156#define OPpDONE_SVREF 64 /* Been through newSVREF once */
554b3eca 157
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158struct op {
159 BASEOP
160};
161
162struct unop {
163 BASEOP
164 OP * op_first;
165};
166
167struct binop {
168 BASEOP
169 OP * op_first;
170 OP * op_last;
171};
172
173struct logop {
174 BASEOP
175 OP * op_first;
176 OP * op_other;
177};
178
179struct condop {
180 BASEOP
181 OP * op_first;
182 OP * op_true;
183 OP * op_false;
184};
185
186struct listop {
187 BASEOP
188 OP * op_first;
189 OP * op_last;
190 U32 op_children;
191};
192
193struct pmop {
194 BASEOP
195 OP * op_first;
196 OP * op_last;
197 U32 op_children;
198 OP * op_pmreplroot;
199 OP * op_pmreplstart;
200 PMOP * op_pmnext; /* list of all scanpats */
201 REGEXP * op_pmregexp; /* compiled expression */
a0d0e21e 202 U16 op_pmflags;
4633a7c4 203 U16 op_pmpermflags;
48c036b1 204 U8 op_pmdynflags;
79072805 205};
a0d0e21e 206
48c036b1 207#define PMdf_USED 0x01 /* pm has been used once already */
b3eb6a9b 208#define PMdf_TAINTED 0x02 /* pm compiled from tainted pattern */
48c036b1 209
b3eb6a9b 210#define PMf_RETAINT 0x0001 /* taint $1 etc. if target tainted */
a0d0e21e 211#define PMf_ONCE 0x0002 /* use pattern only once per reset */
c277df42 212#define PMf_REVERSED 0x0004 /* Should be matched right->left */
ce862d02 213#define PMf_MAYBE_CONST 0x0008 /* replacement contains variables */
a0d0e21e 214#define PMf_SKIPWHITE 0x0010 /* skip leading whitespace for split */
8782bef2 215#define PMf_WHITE 0x0020 /* pattern is \s+ */
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216#define PMf_CONST 0x0040 /* subst replacement is constant */
217#define PMf_KEEP 0x0080 /* keep 1st runtime pattern forever */
218#define PMf_GLOBAL 0x0100 /* pattern had a g modifier */
c90c0ff4 219#define PMf_CONTINUE 0x0200 /* don't reset pos() if //g fails */
a0d0e21e 220#define PMf_EVAL 0x0400 /* evaluating replacement as expr */
8782bef2 221#define PMf_LOCALE 0x0800 /* use locale for character types */
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222#define PMf_MULTILINE 0x1000 /* assume multiple lines */
223#define PMf_SINGLELINE 0x2000 /* assume single line */
8782bef2 224#define PMf_FOLD 0x4000 /* case insensitivity */
a0d0e21e 225#define PMf_EXTENDED 0x8000 /* chuck embedded whitespace */
79072805 226
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227/* mask of bits stored in regexp->reganch */
228#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED)
229
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230struct svop {
231 BASEOP
232 SV * op_sv;
233};
234
235struct gvop {
236 BASEOP
237 GV * op_gv;
238};
239
240struct pvop {
241 BASEOP
242 char * op_pv;
243};
244
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245struct loop {
246 BASEOP
247 OP * op_first;
248 OP * op_last;
249 U32 op_children;
250 OP * op_redoop;
251 OP * op_nextop;
252 OP * op_lastop;
253};
254
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255#define cUNOP ((UNOP*)PL_op)
256#define cBINOP ((BINOP*)PL_op)
257#define cLISTOP ((LISTOP*)PL_op)
258#define cLOGOP ((LOGOP*)PL_op)
259#define cCONDOP ((CONDOP*)PL_op)
260#define cPMOP ((PMOP*)PL_op)
261#define cSVOP ((SVOP*)PL_op)
262#define cGVOP ((GVOP*)PL_op)
263#define cPVOP ((PVOP*)PL_op)
264#define cCOP ((COP*)PL_op)
265#define cLOOP ((LOOP*)PL_op)
79072805 266
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267#define cUNOPo ((UNOP*)o)
268#define cBINOPo ((BINOP*)o)
269#define cLISTOPo ((LISTOP*)o)
270#define cLOGOPo ((LOGOP*)o)
271#define cCONDOPo ((CONDOP*)o)
272#define cPMOPo ((PMOP*)o)
273#define cSVOPo ((SVOP*)o)
274#define cGVOPo ((GVOP*)o)
275#define cPVOPo ((PVOP*)o)
276#define cCVOPo ((CVOP*)o)
277#define cCOPo ((COP*)o)
278#define cLOOPo ((LOOP*)o)
279
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280#define kUNOP ((UNOP*)kid)
281#define kBINOP ((BINOP*)kid)
282#define kLISTOP ((LISTOP*)kid)
283#define kLOGOP ((LOGOP*)kid)
284#define kCONDOP ((CONDOP*)kid)
285#define kPMOP ((PMOP*)kid)
286#define kSVOP ((SVOP*)kid)
287#define kGVOP ((GVOP*)kid)
288#define kPVOP ((PVOP*)kid)
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289#define kCOP ((COP*)kid)
290#define kLOOP ((LOOP*)kid)
291
292#define Nullop Null(OP*)
293
4369b173 294/* Lowest byte of PL_opargs */
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295#define OA_MARK 1
296#define OA_FOLDCONST 2
297#define OA_RETSCALAR 4
298#define OA_TARGET 8
299#define OA_RETINTEGER 16
300#define OA_OTHERINT 32
301#define OA_DANGEROUS 64
302#define OA_DEFGV 128
303
db173bac 304/* The next 4 bits encode op class information */
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305#define OA_CLASS_MASK (15 << 8)
306
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307#define OA_BASEOP (0 << 8)
308#define OA_UNOP (1 << 8)
309#define OA_BINOP (2 << 8)
310#define OA_LOGOP (3 << 8)
311#define OA_CONDOP (4 << 8)
312#define OA_LISTOP (5 << 8)
313#define OA_PMOP (6 << 8)
314#define OA_SVOP (7 << 8)
315#define OA_GVOP (8 << 8)
293d3ffa 316#define OA_PVOP_OR_SVOP (9 << 8)
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317#define OA_LOOP (10 << 8)
318#define OA_COP (11 << 8)
319#define OA_BASEOP_OR_UNOP (12 << 8)
320#define OA_FILESTATOP (13 << 8)
321#define OA_LOOPEXOP (14 << 8)
322
323#define OASHIFT 12
a0d0e21e 324
4369b173 325/* Remaining nybbles of PL_opargs */
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326#define OA_SCALAR 1
327#define OA_LIST 2
328#define OA_AVREF 3
329#define OA_HVREF 4
330#define OA_CVREF 5
331#define OA_FILEREF 6
332#define OA_SCALARREF 7
333#define OA_OPTIONAL 8
334